package com.morn.fanfou;

import java.util.ArrayList;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TabHost;
import android.widget.TabWidget;
import android.widget.TextView;
import android.widget.Toast;

import com.morn.fanfou.fragment.MessageFragment;
import com.morn.fanfou.fragment.MoreFragment;
import com.morn.fanfou.fragment.SearchFragment;
import com.morn.fanfou.fragment.StatusListFragment;

public class MainActivity extends FragmentActivity {

	TabHost mTabHost;
	ViewPager mViewPager;
	TabsAdapter mTabsAdapter;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		setContentView(R.layout.main_layout);

		LayoutInflater layoutInflater = LayoutInflater.from(this);

		LinearLayout firstPageTab = (LinearLayout) LayoutInflater.from(this)
				.inflate(R.layout.minimenu, null);
		TextView firstPageTabLabel = (TextView) firstPageTab
				.findViewById(R.id.menu_text);
		firstPageTabLabel.setText(R.string.header_title_first_page);
		ImageView firstPageImage = (ImageView) firstPageTab
				.findViewById(R.id.menu_image);
		firstPageImage.setImageResource(R.drawable.ic_home);

		LinearLayout messageTab = (LinearLayout) layoutInflater.inflate(
				R.layout.minimenu, null);
		TextView messageTabLabel = (TextView) messageTab
				.findViewById(R.id.menu_text);
		messageTabLabel.setText(R.string.header_title_message);
		ImageView messageImage = (ImageView) messageTab
				.findViewById(R.id.menu_image);
		messageImage.setImageResource(R.drawable.ic_message);

		LinearLayout atMeTab = (LinearLayout) layoutInflater.inflate(
				R.layout.minimenu, null);
		TextView atMeTabLabel = (TextView) atMeTab.findViewById(R.id.menu_text);
		atMeTabLabel.setText(R.string.header_title_atMe);
		ImageView atMeImage = (ImageView) atMeTab.findViewById(R.id.menu_image);
		atMeImage.setImageResource(R.drawable.ic_message);

		LinearLayout searchTab = (LinearLayout) layoutInflater.inflate(
				R.layout.minimenu, null);
		TextView searchTabLabel = (TextView) searchTab
				.findViewById(R.id.menu_text);
		searchTabLabel.setText(R.string.header_title_search);
		ImageView searchImage = (ImageView) searchTab
				.findViewById(R.id.menu_image);
		searchImage.setImageResource(R.drawable.ic_search);

		LinearLayout moreTab = (LinearLayout) layoutInflater.inflate(
				R.layout.minimenu, null);
		TextView moreTabLabel = (TextView) moreTab.findViewById(R.id.menu_text);
		moreTabLabel.setText(R.string.header_title_more);
		ImageView moreImage = (ImageView) moreTab.findViewById(R.id.menu_image);
		moreImage.setImageResource(R.drawable.ic_more);

		mTabHost = (TabHost) findViewById(android.R.id.tabhost);
		mTabHost.setup();

		mViewPager = (ViewPager) findViewById(R.id.main_page_view);

		mTabsAdapter = new TabsAdapter(this, mTabHost, mViewPager);

		Bundle firstPageBundle = new Bundle();
		firstPageBundle.putInt("statusType",
				StatusListFragment.TYPE_STATUS_FIRSTPAGE);
		mTabsAdapter.addTab(
				mTabHost.newTabSpec("firstPage").setIndicator(firstPageTab),
				StatusListFragment.class, firstPageBundle);

		Bundle atMeBundle = new Bundle();
		atMeBundle.putInt("statusType", StatusListFragment.TYPE_STATUS_ATME);
		mTabsAdapter.addTab(mTabHost.newTabSpec("atMe").setIndicator(atMeTab),
				StatusListFragment.class, atMeBundle);

		mTabsAdapter.addTab(
				mTabHost.newTabSpec("message").setIndicator(messageTab),
				MessageFragment.class, null);

		mTabsAdapter.addTab(
				mTabHost.newTabSpec("search").setIndicator(searchTab),
				SearchFragment.class, null);
		mTabsAdapter.addTab(mTabHost.newTabSpec("more").setIndicator(moreTab),
				MoreFragment.class, null);

		if (savedInstanceState != null) {
			mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab"));
		}
	}

	@Override
	public void onBackPressed() {
		Toast.makeText(this, "Destroy", Toast.LENGTH_SHORT).show();
		super.onBackPressed();
	}
	
	@Override
	protected void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		outState.putString("tab", mTabHost.getCurrentTabTag());
	}

	/**
	 * This is a helper class that implements the management of tabs and all
	 * details of connecting a ViewPager with associated TabHost. It relies on a
	 * trick. Normally a tab host has a simple API for supplying a View or
	 * Intent that each tab will show. This is not sufficient for switching
	 * between pages. So instead we make the content part of the tab host 0dp
	 * high (it is not shown) and the TabsAdapter supplies its own dummy view to
	 * show as the tab content. It listens to changes in tabs, and takes care of
	 * switch to the correct paged in the ViewPager whenever the selected tab
	 * changes.
	 */
	public static class TabsAdapter extends FragmentPagerAdapter implements
			TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener {
		private final Context mContext;
		private final TabHost mTabHost;
		private final ViewPager mViewPager;
		private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();

		static final class TabInfo {
			private final String tag;
			private final Class<?> clss;
			private final Bundle args;

			TabInfo(String _tag, Class<?> _class, Bundle _args) {
				tag = _tag;
				clss = _class;
				args = _args;
			}
		}

		static class DummyTabFactory implements TabHost.TabContentFactory {
			private final Context mContext;

			public DummyTabFactory(Context context) {
				mContext = context;
			}

			@Override
			public View createTabContent(String tag) {
				View v = new View(mContext);
				v.setMinimumWidth(0);
				v.setMinimumHeight(0);
				return v;
			}
		}

		public TabsAdapter(FragmentActivity activity, TabHost tabHost,
				ViewPager pager) {
			super(activity.getSupportFragmentManager());
			mContext = activity;
			mTabHost = tabHost;
			mViewPager = pager;
			mTabHost.setOnTabChangedListener(this);
			mViewPager.setAdapter(this);
			mViewPager.setOnPageChangeListener(this);
		}

		public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
			tabSpec.setContent(new DummyTabFactory(mContext));
			String tag = tabSpec.getTag();

			TabInfo info = new TabInfo(tag, clss, args);
			mTabs.add(info);
			mTabHost.addTab(tabSpec);
			notifyDataSetChanged();
		}

		@Override
		public int getCount() {
			return mTabs.size();
		}

		@Override
		public Fragment getItem(int position) {
			TabInfo info = mTabs.get(position);
			return Fragment.instantiate(mContext, info.clss.getName(),
					info.args);
		}

		@Override
		public void onTabChanged(String tabId) {
			int position = mTabHost.getCurrentTab();
			mViewPager.setCurrentItem(position);
		}

		@Override
		public void onPageScrolled(int position, float positionOffset,
				int positionOffsetPixels) {
		}

		@Override
		public void onPageSelected(int position) {
			// Unfortunately when TabHost changes the current tab, it kindly
			// also takes care of putting focus on it when not in touch mode.
			// The jerk.
			// This hack tries to prevent this from pulling focus out of our
			// ViewPager.
			TabWidget widget = mTabHost.getTabWidget();
			int oldFocusability = widget.getDescendantFocusability();
			widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
			mTabHost.setCurrentTab(position);
			widget.setDescendantFocusability(oldFocusability);
		}

		@Override
		public void onPageScrollStateChanged(int state) {
		}
	}

	public void clickLeftButton(View v) {
		Intent intent = new Intent(this, UpdateActivity.class);
		this.startActivity(intent);

		// Toast.makeText(this, "dialog", Toast.LENGTH_SHORT).show();
		// FragmentTransaction ft =
		// this.getSupportFragmentManager().beginTransaction();
		// Fragment prev =
		// getSupportFragmentManager().findFragmentByTag("dialog");
		// if (prev != null) {
		// ft.remove(prev);
		// }
		// ft.addToBackStack(null);
		// ImageDialogFragment newFragment = new ImageDialogFragment();
		// newFragment.show(ft, "dialog");
	}
}